SECTION 7. APPROPRIATIONS CONSTITUTE BASIS OF EXPENDITURES AND ARE SUBJECT TO REVISION.

   The Mayor shall file a copy of the budget as approved by the Council, with the Director of Finance, who shall authorize all expenditures for the offices, departments and agencies to be made from the appropriations on the basis of approved allocations and not otherwise. An approved appropriation may be revised during the fiscal year in the same manner as the original appropriation was made. If, at any time during the fiscal year, the Finance Director and the Mayor shall ascertain that the available income, plus balances, for the year will be less than the total appropriations, the Mayor shall request the Council to reconsider the budgets and appropriations so as to forestall the making of expenditures in excess of the said income.